Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Andromeda [1] |
Right ascension | 23h 39m 05.8103s [2] |
Declination | +42° 27′ 57.505″ [2] |
Apparent magnitude (V) | +10.47 [3] |
Characteristics | |
Spectral type | F8V [4] |
B−V color index | 0.41 [3] |
Variable type | planetary transit [5] |
Astrometry | |
Radial velocity (Rv) | −22.13(44) [6] km/s |
Proper motion (μ) |
RA: −20.202(18)
mas/
yr
[2] Dec.: 2.996(18) mas/ yr [2] |
Parallax (π) | 3.6459 ± 0.0221 mas [2] |
Distance | 895 ± 5
ly (274 ± 2 pc) |
Absolute magnitude (MV) | +3.36(16) [5] |
Details | |
Mass | 1.29 ± 0.06 [7] M☉ |
Radius | 1.46 ± 0.06 [7] R☉ |
Luminosity | 3.57+0.52 −0.43 [5] L☉ |
Surface gravity (log g) | 4.22 ± 0.03 [8] cgs |
Temperature | 6,570 ± 80 [7] K |
Metallicity [Fe/H] | –0.13 ± 0.08 [7] dex |
Rotational velocity (v sin i) | 8.7 ± 1.0 [7] km/s |
Age | 2.3+0.5 −0.7 [7] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
HAT-P-6 also named Sterrennacht [10] is a star in the constellation Andromeda, located approximately 895 light years or 274 parsecs away from the Earth. It is an F-type star, implying that it is hotter and more massive than the Sun. The apparent magnitude of the star is +10.54, which means that it can only be visible through the telescope. The absolute magnitude of +3.36 is brighter than the Sun's +4.83, meaning that the star itself is brighter than the Sun. [5] A search for a binary companion star using adaptive optics at the MMT Observatory turned out negative. [11]
The name Sterrennacht (Starry Night) was selected in the NameExoWorlds held by the IAU after a painting by Van Gogh. [10]
The companion planet HAT-P-6b is a transiting planet discovered on October 15, 2007 by the HATNet Project. The planet's true mass is slightly more than Jupiter at only 5.7%, but the radius is 33% greater, making the planet's density of 0.45 g/cm3. Its large size compared to mass comes from the great amount of heat received from the nearby star that expands the planet's atmosphere, categorizing as " hot Jupiter". The orbital period is 3.852985 days and the distance from its star is 0.05235 AU. [5] The inclination of the orbit with respect to the stellar rotation axis is roughly 166º. [12]
Companion (in order from star) |
Mass |
Semimajor axis ( AU) |
Orbital period ( days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b / Nachtwacht | 1.106+0.039 −0.040 MJ |
0.05239+0.00080 −0.00082 |
3.852985±0.000005 | <0.044 | 166±10 [12] ° | 1.330±0.061 RJ |
Observation data Epoch J2000.0 Equinox J2000.0 | |
---|---|
Constellation | Andromeda [1] |
Right ascension | 23h 39m 05.8103s [2] |
Declination | +42° 27′ 57.505″ [2] |
Apparent magnitude (V) | +10.47 [3] |
Characteristics | |
Spectral type | F8V [4] |
B−V color index | 0.41 [3] |
Variable type | planetary transit [5] |
Astrometry | |
Radial velocity (Rv) | −22.13(44) [6] km/s |
Proper motion (μ) |
RA: −20.202(18)
mas/
yr
[2] Dec.: 2.996(18) mas/ yr [2] |
Parallax (π) | 3.6459 ± 0.0221 mas [2] |
Distance | 895 ± 5
ly (274 ± 2 pc) |
Absolute magnitude (MV) | +3.36(16) [5] |
Details | |
Mass | 1.29 ± 0.06 [7] M☉ |
Radius | 1.46 ± 0.06 [7] R☉ |
Luminosity | 3.57+0.52 −0.43 [5] L☉ |
Surface gravity (log g) | 4.22 ± 0.03 [8] cgs |
Temperature | 6,570 ± 80 [7] K |
Metallicity [Fe/H] | –0.13 ± 0.08 [7] dex |
Rotational velocity (v sin i) | 8.7 ± 1.0 [7] km/s |
Age | 2.3+0.5 −0.7 [7] Gyr |
Other designations | |
Database references | |
SIMBAD | data |
HAT-P-6 also named Sterrennacht [10] is a star in the constellation Andromeda, located approximately 895 light years or 274 parsecs away from the Earth. It is an F-type star, implying that it is hotter and more massive than the Sun. The apparent magnitude of the star is +10.54, which means that it can only be visible through the telescope. The absolute magnitude of +3.36 is brighter than the Sun's +4.83, meaning that the star itself is brighter than the Sun. [5] A search for a binary companion star using adaptive optics at the MMT Observatory turned out negative. [11]
The name Sterrennacht (Starry Night) was selected in the NameExoWorlds held by the IAU after a painting by Van Gogh. [10]
The companion planet HAT-P-6b is a transiting planet discovered on October 15, 2007 by the HATNet Project. The planet's true mass is slightly more than Jupiter at only 5.7%, but the radius is 33% greater, making the planet's density of 0.45 g/cm3. Its large size compared to mass comes from the great amount of heat received from the nearby star that expands the planet's atmosphere, categorizing as " hot Jupiter". The orbital period is 3.852985 days and the distance from its star is 0.05235 AU. [5] The inclination of the orbit with respect to the stellar rotation axis is roughly 166º. [12]
Companion (in order from star) |
Mass |
Semimajor axis ( AU) |
Orbital period ( days) |
Eccentricity | Inclination | Radius |
---|---|---|---|---|---|---|
b / Nachtwacht | 1.106+0.039 −0.040 MJ |
0.05239+0.00080 −0.00082 |
3.852985±0.000005 | <0.044 | 166±10 [12] ° | 1.330±0.061 RJ |